Improved processes for preparing intermediates useful for preparing antibacterial N-[1-oxo2-alkyl-3-(N-hydroxyformamido)-propyl}-(carbonylamino-aryl or -heteroaryl)-azacyclo4-7alkanes or thiazacyclo4-7alkanes, which have one or more of the following features: (1) make use of a particular I3-lactam intermediate; (2) which make use of a particular resolving agents, enantiomerically pure substituted propionic acids, especially (R)-2-butyl-3-hydroxypropionic acid; (3) which avoid the use of hydrogen peroxide; and (4) which facilitate selective debenzylation reducing production of waste by-products.
改进的过程用于制备中间体,用于制备具有以下特征的抗菌N-[1-氧代2-烷基-3-(N-羟基甲酰胺基)丙基}-(羰基
氨基芳基或杂芳基)-氮杂环4-7烷或
硫杂环4-7烷:(1)利用特定的I3-内酰胺中间体;(2)利用特定的分离剂,对映异构体纯度替代
丙酸,特别是(R)-2-丁基-
3-羟基丙酸;(3)避免使用
过氧化氢;和(4)有助于选择性脱苯基还原产生的废弃副产物。